PhabricatorMonospacedFontSetting.php
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	<?php

	final class PhabricatorMonospacedFontSetting
	extends PhabricatorStringSetting {

	const SETTINGKEY = 'monospaced';

	public function getSettingName() {
	return pht('Monospaced Font');
	}

	protected function getControlInstructions() {
	return pht(
	'You can customize the font used when showing monospaced text, '.
	'including source code. You should enter a valid CSS font declaration '.
	'like: `13px Consolas`');
	}

	public function validateTransactionValue($value) {
	if (!strlen($value)) {
	return;
	}

	$filtered = self::filterMonospacedCSSRule($value);
	if ($filtered !== $value) {
	throw new Exception(
	pht(
	'Monospaced font value "%s" is unsafe. You may only enter '.
	'letters, numbers, spaces, commas, periods, forward slashes '.
	'and double quotes.',
	$value));
	}
	}

	public static function filterMonospacedCSSRule($monospaced) {
	// Prevent the user from doing dangerous things.
	return preg_replace('([^a-z0-9 ,"./]+)i', '', $monospaced);
	}

	}